This study includes an approach to interdisciplinary diagnosis and intervention in paediatric patients with neuropsychiatric disorders. Interdisciplinary intervention is a combination of treatments from different disciplines that simultaneously address the patient's pathology in order to achieve a better adaptation to the environment in which the patient lives. This article describes the process of neuropsychological intervention in an interdisciplinary context, starting with the assessment, rehabilitation and reassessment of a paediatric patient diagnosed with childhood psychosis and reduction of the left amygdala-hippocampal complex using a single case methodology.